K頻段調頻連續波雷達系統之混頻器設計

Abstract

本論文利用0.18微米互補性金屬氧化物半導體(CMOS)製程，提出了一個24GHz 微波降頻混波器應用在K 頻段之調頻連續波(FMCW)雷達系統。電路設計方面，考慮到高頻之本地振盪訊號能量取得不易，故於設計上致力於降低最佳操作之本地振盪訊號能量點；此外為了免於干擾系統中其它電路的功能，本設計藉由高對稱性之佈局技術、抗干擾之傳輸線應用與混波器架構之選擇，提升混頻器在整個系統的隔離度(isolation)。被動元件方面，使用互補式金屬圖案所構成合成傳輸線(CCS TL)、MIM電容、MFC電容。

This thesis presents a 24GHz microwave down-converting mixer for K-band Frequency Modulated Continuous Wave (FMCW) Radar System which is realized in 0.18μm CMOS process. At circuit design level, due to the difficulty of acquiring power for high frequency local oscillating signal, reducing the optimal operating power level is a priority. In addition, high symmetrical layout technique, application of interference rejecting transmission lines, and the choice of the schematic in mixer all contribute to outstanding isolation performance. Complementary-conducting-strips (CCS) transmission line, Metal-Insulator-Metal (MIM) capacitor, and Metal-Finger Capacitor (MFC) are used as passive components.